package com.sky.aspect;


import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.enumeration.OperationType;
import com.sky.utils.ThreadLocalUtil;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;


/**
 * Created with IntelliJ IDEA.
 *
 *自动填充公共字段的切面
 * @Package: com.sky.aspect
 * @ClassName: AutoFillAspect
 * @author: xingjiaxing
 * @createTime: 2023/1/16 14:05
 * @description:
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.anno.AutoFill)")
    public void autoFillPointCut(){}

    // 实现自动填充
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行数据填充");
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        //获取注解对象
        AutoFill autoFill = method.getAnnotation(AutoFill.class);
        //获取当前数据库操作类型
        OperationType operationType = autoFill.value();


        //获取当前被拦截的方法的参数，即实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }

        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = ThreadLocalUtil.getCurrentUser();

        //根据当前不同的操作类型，为对应的属性通过反射赋值
        if (operationType == OperationType.INSERT){
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                //通过反射为对象赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if (operationType == OperationType.UPDATE){
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }



    }

}
